Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d6838abe60f8651…

MALICIOUS

PDF

79.0 KB Created: 2020-12-21 18:43:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3aef75b23479ef1bc24aebbe68e51107 SHA-1: 431213254a133a3ca41df4527be37921d8a2e55b SHA-256: 6d6838abe60f86517763eb2e1dc62be420e424961212b65a49047a4778444c4f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to disposable hosting services, suggesting a link farm designed to redirect users to potentially harmful content. The presence of 'utm_term' parameters in some URLs further supports a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffnew.ru/123?utm_term=crusader+leveling+build+season+20
    • https://sumolepixa.weebly.com/uploads/1/3/4/6/134635742/235bd.pdf
    • https://fufukarebalomok.weebly.com/uploads/1/3/4/3/134352968/pupenorigobar_wufawolivila_soviximos.pdf
    • https://kazanuwe.weebly.com/uploads/1/3/2/6/132683097/tunotoxuju.pdf
    • https://banetopebored.weebly.com/uploads/1/3/4/8/134874573/pisaru_vebav.pdf
    • https://rikutokamalaru.weebly.com/uploads/1/3/4/3/134319242/betigel.pdf
    • https://likuxosudiva.weebly.com/uploads/1/3/4/6/134603152/wizekotu_nefowajupilo_nasag.pdf
    • https://gikesusemu.weebly.com/uploads/1/3/4/7/134775173/3a3b6b44308d5.pdf
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/mosabiwinuvor.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lowuwofuxali/kaduvimipixen.pdf
    • https://s3.amazonaws.com/wovitiku/skinnytaste_chicken_fajitas_sheet_pan.pdf
    • https://s3.amazonaws.com/bivanud/guzoroxok.pdf
    • https://s3.amazonaws.com/henghuili-files2/state_volleyball_tournament_2019_iowa.pdf
    • https://static1.squarespace.com/static/5fc1162b68612547ed5f39f0/t/5fc5a06c3c02f22b9dce4bd0/1606787184574/9503045708.pdf
    • https://s3.amazonaws.com/kezemiradigu/adp_paycheck_information.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4d673c02f22b9d039e5c/1606372713829/mefesetiwezazibosekutum.pdf
    • https://static1.squarespace.com/static/5fc011b424b06a7eb3fa7d30/t/5fc195d7fa04221c715b60f5/1606522328896/sowogesisinazezivuzafe.pdf
    • https://static1.squarespace.com/static/5fde7b11617c13787ca3ef9c/t/5fdef63ff11f517dbbd1416a/1608447551568/45293124197.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5b2.bin
a70c9f4edfca0bc054800a0cc1c47b11a5af610df94040ec7d50775353fb25dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B2 5372 bytes
font_01_sfnt_off00010803.bin
7d6a96c33f4136240a489475698c41caeb605d8afe08f1747f9a124e58108ec1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10803 12196 bytes

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